1. CRH

CRH plc is an international building materials group. The group was formed through a merger in 1970 of two leading Irish public companies, Cement Limited (established in 1936) and Roadstone Limited (1949). It is headquartered in Dublin.

2. Trane Technologies

Formerly Ingersoll-Rand, Trane Technologies was formed in early 2020 when part of the business separated and combined with Gardner Denver (which now trades as Ingersoll Rand Inc). Trane is listed on the NYSE. The industrial techology firm makes climate control system...

3. Kingspan

Kingspan manufactures insulation and building envelope solutions for the construction industry. It is based in Ireland but has operations in western and eastern Europe, the United States, India, Australasia and the Middle East.

4. Grafton

The Grafton Group plc is a builders merchanting, DIY retailing and mortar manufacturing markets in Britain and Ireland. In Ireland it trades under the brands Woodie’s DIY , Heiton Buckley, Chadwicks and MacNaughton Blair. These businesses turnover €2 billion from 600 lo...

5. E & I Engineering Ireland

E&I Engineering provides switchgear, power distribution solutions and energy management systems throughout Ireland, the UK and mainland Europe. Its team of chartered engineers manages every aspect of a project from concept design with consultants, manufacture, delivery,...

6. Mercury Engineering

Mercury is a privately-owned company headquartered in Dublin, Ireland. The company began in 1972 and has operations in Ireland, UK, Central Europe and Scandinavia. Mercury Engineering is a provider of solutions within the construction industry be it management contra...

7. Exyte Northern Europe Limited

Exyte is a global leader in design, engineering and delivery of facilities for high-tech industries. Exyte has operated in Ireland and Northern Ireland since 2000, applying global expertise, technology and engineering excellence to deliver some of the area's most advanc...

8. Jones Engineering Holdings

Jones Engineering Group is a multi-disciplined engineering company offering the full range of process engineering and building services installations. Founded in 1890, it is celebrating over 125 years of engineering and construction excellence. The firm has a number ...

9. Cairn Homes

Cairn builds new homes.

10. KN Circet

KN Circet is an infrastructure and utilities services provider operating in Ireland, UK and internationally. Its areas of expertise span civil engineering, telecoms, construction, wireless technologies, rail infrastructure and home energy services. Its Irish office is l...

11. PM Group

Project Management Holdings provides design, engineering, architecture, project planning and construction management services. Its clients are in private industry and public sector and it concentrates on the biopharma, food, energy and healthcare sectors. It was...

12. Epsa Ireland

Epsa Ireland provides construction services. It is a subsidiary of Spanish group Epsa Internactional S.A.

13. Brett Martin

Established in 1958, Brett Martin is a privately owned family business. With headquarters located on its founding site in Co Antrim, the manufacturing company employs almost 800 people at several locations throughout the UK and Europe. The company supplies specialist ...

14. Sisk Group

SISK Group is a fith generation family business primarily known for the construction division John Sisk and Son which operates in Ireland, the UK, Poland and the Middle East. It has grown from a small local builder founded in Cork more than 150 years ago to an intern...

15. Jacobs Engineering

Jacobs is one of the world’s largest and most diverse providers of technical professional and construction services, including all aspects of architecture, engineering and construction, operations and maintenance, as well as scientific and specialty consulting. It s...

16. Dornan Engineering

Dornan Engineering is a mechanical, electrical and instrumentation contractor operating in Ireland, the UK, Sweden, Germany, Belgium and Russia. Recent projects include the supply and installation of complete electrical and mechanical services on the new air traffic con...

17. Saint-Gobain Construction Products

Saint-Gobain Construction Products manufactures and supplies building materials. Formerly known as Gypsum it has operated in Ireland since 1936. In 2005, it became part of the Saint-Gobain group.

18. Glennon Brothers

Since 1913, Glennon Brothers has been manufacturing timber products. Through Glennon Brothers plants in Longford and Fermoy, and Windymains Timber and Adam Wilsons in Scotland, it supplies both the Irish and UK markets with products for the construction, pallet wood and...

19. Graham

Graham is a privately owned company operating in the construction, asset management and project investment markets. The company is involved in construction through John Graham (Dromore) Ltd, in asset management through Graham Asset Management Ltd and investments through...

20. Gilbert Ash

Ards Holdings is the parent company of Gilbert-Ash which has been in business for more than 100 years and is one of the largest construction companies operating in Northern Ireland. Gilbert-Ash is well known for high profile projects such as the Odyssey complex, Victor...